lse;
			}
		}

		return apply_filters( 'wpml_is_comment_query_filtered', $filtered, $post_id );
	}

	/**
	 * Adds a join with the posts table to the query only if necessary because the comment query is not filtered
	 * by post variables
	 *
	 * @param WP_Comment_Query $comment_query
	 * @return string
	 */
	private function get_comment_query_join( $comment_query ){
		$posts_params = array(
			'post_author',
			'post_name',
			'post_parent',
			'post_status',
			'post_type',
			'post_author__not_in',
			'post_author__in'
		);
		$query_vars   = isset( $comment_query->query_vars ) ? array_filter ( $comment_query->query_vars ) : array();
		$plucked      = wp_array_slice_assoc ( $query_vars, $posts_params );
		$post_fields  = array_filter ( $plucked );
		$posts_query  = !empty( $post_fields );

		$join_part = $posts_query ? " AND " : "JOIN {$this->wpdb->posts} ON ";

		return $join_part;
	}

	/**
	 * @param $requested_id
	 *
	 * @return bool|mixed|null|string
	 */
	private function get_current_language( $requested_id ) {
		$current_language = null;
		if ( $requested_id ) {
			$current_language = $this->post_translations->get_element_lang_code( $requested_id );
		}
		if ( ! $current_language ) {
			$current_language = $this->sitepress->get_current_language();
		}
		if ( ! $current_language ) {
			$current_language = $this->sitepress->get_default_language();
		}

		return $current_language;
	}
}